Doepfer A-124SE Wasp Eurorack Voltage Controlled Filter Module
Doepfer A-124SE - Wasp Filter
The Doepfer A-124SE is a special 12dB multimode filter using the ‘strange’ filter circuit of the ‘EDP Wasp’ (an analog synthesizer with a black / yellow case built in the end of the seventies, manufactured by the UK company ‘Electronic Dream Plant’ with Chris Huggett and Adrian Wagner). This design ‘abuses’ digital inverters as analog operational amplifiers leading to distortions and other ‘dirty’ effects that generate the specific sound of the filter.
The filter is equipped with a band pass output and a combined low / notch / high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same time (ie middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates. The module does not feature self-oscillation in contrast to most of the other filters of the A-100 system.
Specifications
Inputs: | Audio In, CV In (2x) |
Outputs: | Bandpass Out, Low / High pass Mix Out |
Controls: | Audio and CV attenuator, Frequency Resonance, LP / HP Mix |
Width: | 8hp |
Max Depth: | 40.3mm |
Power: | +12V: +30mA |
-12V: -10mA |